package edu.usx.server.config.security;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.web.authentication.WebAuthenticationDetailsSource;
import org.springframework.web.filter.OncePerRequestFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * Jwt登录授权过滤器
 */
public class JwtAuthorizationTokenFilter extends OncePerRequestFilter {
    @Value("${jwt.tokenHeader}")
    private String tokenHeader;
    @Value("${jwt.tokenHead}")
    private String tokenHead;
    @Autowired
    private JwtTokenUtil jwtTokenUtil;
    @Autowired
    private UserDetailsService userDetailsService;
    @Override
    protected void doFilterInternal(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, FilterChain filterChain) throws ServletException, IOException {
        //获取tokenHeader
        String authHeader= httpServletRequest.getHeader(tokenHeader);
        //判断头部是否存在或以head开头
        if(authHeader!=null && authHeader.startsWith(tokenHead)){
            //截取
            String authToken=authHeader.substring(tokenHead.length());
            //获取用户名
            String username= jwtTokenUtil.getUserNameFromToken(authToken);
            System.out.println(username);
            //判断用户名不为空并且未登录
            if(username!=null && SecurityContextHolder.getContext().getAuthentication()==null){
                UserDetails userDetails=userDetailsService.loadUserByUsername(username);
                //验证token是否有效，重新设置用户对象
                if(jwtTokenUtil.validateToken(authToken,userDetails)){
                    UsernamePasswordAuthenticationToken authenticationToken=new UsernamePasswordAuthenticationToken(userDetails,
                            null,
                            userDetails.getAuthorities());
                    authenticationToken.setDetails(new WebAuthenticationDetailsSource().buildDetails(httpServletRequest));
                    SecurityContextHolder.getContext().setAuthentication(authenticationToken);
                }
            }
        }
        filterChain.doFilter(httpServletRequest,httpServletResponse);
    }
}
